GB517788A - Improvements in independent simultaneous telegraphy and telephony systems - Google Patents

Improvements in independent simultaneous telegraphy and telephony systems

Info

Publication number
GB517788A
GB517788A GB23106/38A GB2310638A GB517788A GB 517788 A GB517788 A GB 517788A GB 23106/38 A GB23106/38 A GB 23106/38A GB 2310638 A GB2310638 A GB 2310638A GB 517788 A GB517788 A GB 517788A
Authority
GB
United Kingdom
Prior art keywords
exchange
telephone
filters
telegraphic
frequencies
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB23106/38A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRANSMISSIONS LOTH HAVAS
Original Assignee
TRANSMISSIONS LOTH HAVAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TRANSMISSIONS LOTH HAVAS filed Critical TRANSMISSIONS LOTH HAVAS
Publication of GB517788A publication Critical patent/GB517788A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
GB23106/38A 1937-08-06 1938-08-04 Improvements in independent simultaneous telegraphy and telephony systems Expired GB517788A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR834664T 1937-08-06
FR50102T 1938-07-18

Publications (1)

Publication Number Publication Date
GB517788A true GB517788A (en) 1940-02-08

Family

ID=32929198

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23106/38A Expired GB517788A (en) 1937-08-06 1938-08-04 Improvements in independent simultaneous telegraphy and telephony systems

Country Status (3)

Country Link
BE (1) BE433401A (enrdf_load_stackoverflow)
FR (1) FR50102E (enrdf_load_stackoverflow)
GB (1) GB517788A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR50102E (fr) 1939-12-13
BE433401A (enrdf_load_stackoverflow) 1939-04-29

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